"I Feel Fine" is a riff-driven rock song written by John Lennon (credited to Lennon–McCartney) and released in 1964 by the Beatles as the A-side of their eighth British single. The song is notable for being one of the first uses of guitar feedback in popular music.
Lennon wrote the guitar riff while in the studio recording "Eight Days a Week." "I wrote 'I Feel Fine' around that riff going on in the background", he recalled. "I told them I'd write a song specially for the riff. So they said, 'Yes. You go away and do that', knowing that we'd almost finished the album Beatles for Sale. Anyway, going into the studio one morning, I said to Ringo, 'I've written this song but it's lousy'. But we tried it, complete with riff, and it sounded like an A side, so we decided to release it just like that."
The single reached the top of the British charts on 12 December of that year, displacing the Rolling Stones' "Little Red Rooster", and remained there for five weeks. "I Feel Fine" was also the first Beatles single to be released almost concurrently in the US and the UK. The song has sold 1.41 million copies in the UK. The song topped the US Billboard Hot 100 charts for three weeks in late 1964/early 1965.
Two different music videos directed by Joe McGrath were filmed. Both feature various bits of gym equipment. In one, George, Paul and John perform the song while Ringo rides the exercise bike. In the other they are all eating Fish and Chips, while trying to mime to the song.